Pressure-regulating means for electrically-operated apparatus



Jan. 1; 1924 M. J. QUINN PRESSURE REGULATING MEANS FOR ELECTRICALLYOPERATED APPARATUS Filed NOV. 20, 1920 Patented Jan. 1, 1924-.

UNITED STATES MARTIN J'OSEPH QUINN, OF TORONTO, ONTARIO, CANADA.

PRESSURE-REGULATING MEANS FOR'ELECTRICALLY-OPERATED APPARATUS.

Application filed November 20, 1920. Serial No. 425,542.

To all whom it may concern Be it known that I, MARTIN JOSEPH QUINN, ofthe city-of Toronto, in the county of York and Province of Ontario,Dominion of Canada, have invented certain new and useful Improvements inPressure-Regulating Means for Electrically-Operated Apparatus; and Ihereby declare the following to be a full, clear, and exact descriptionof the same. j

This invention relates to a pressure-regulating means for electricallyoperated .pumping and other apparatus in which'the fluid agent issubject to variations of pressure, the object of the invention being tosensitively and positively control the circuit of the current as thepressure of the fluid agent rises or falls to predetermined limits,

this object being'attained .by a peculiarly constructed pressureactuated motor which respectively opens andcloses the switch controllingthe circuit of the current, when the pressure of the fluid agent-risesor falls to that for which the motor is set.

foregoing object may be attained, with the parts in their low pressureposition, and

Fig. 2, is a similar'view taken at'right angles to Fig. 1, with theparts in their high pressure position.

Like characters of reference refer to like parts throughout thespecification and draw- 'ings.

In carryingout the invention the pressure regulating apparatus mustpositively and sensitively act and react during the changes of pressureof the fluid agent, and it is therefore necessary that its motivepartsshould be so constructed as to enable it to correctly perform thesefunctions.

In the preferred typeof apparatus is a pressure actuated motor,consisting of a cylindrical walla, having an internal anin position.

or pipe 6 with which thenipple c isconnected, and surrounding thepressure chamber is a ledge 0.

Overlying the pressure chamber 0'. is an elastic diaphragm f ofcorresponding diameter to the inner'diameter of the cap 0.

The end 5 of they enlargement b is opposed to the ledge 0 and inconjunction with the cap 0 securelyholds the diaphragm The diaphragm ispreferably made of pure rubber and of a' thickness suitable to thepressure of the fluid agent.

'Axially movable in the housing of the motor is a piston g ofcorresponding crosssectional shape and dimens ons to the bore oftheenlargement bjand near the upper end of the pistonis a surroundingflange g which, when the piston is in its low pressure position, engagesthe shoulder b at theother end of the enlargement, and arrests themovement of'the piston towards the diaphragm. I I

The length of the piston from the flange gto the piston head is slightlyless than that of the enlargement b sothat when the flange g is seatedon the shoulder 12, the piston head Z) will not be in contact underpressure with the diaphragm f until the latter is'distended by'thepressure of the fluid agent. The piston head 6 is of a concave shape andthe edge 6 is slightly rounded to avoid the cutting of the diaphragmwhen in contact therewith.

' Centrally formed through the cap d is a screw-threaded bore d, andadjustable through thebore cl is an externally screwthreaded hollow plugit for regulating the pressure at which the motor will operate, the headit of the plug being preferably hexagonal. Fitted to the pistonis'oneend of a piston rod 2' which extends axially through the bore of theplug and beyond the head h. Encircling the piston rodc' is a washer z"and bearing against the washer z" and the piston is a coiled'spring j,normally pressing the piston 9 towards the diaphragm, and resisting itsmovement therefrom.

In the operation of the apparatus thusfar described, the fluid agent,entering the pressure chamber, against the piston head b and moves thepiston in the direction indicated by arrow in the drawings until thepiston has reached the limitofits high pressure position, the pistonthroughout its travel covering the whole active area of the diaphragm.

distends the diaphragm When the pressure of the fluid agent falls thepiston'moves back to its low pressure position under the influence ofthe spring and closes the circuit.

The diaphragm,- being made of elastic While this pressure actuated'motormay be used toopen and close any standard or approved-type of'switch itis in the present case especially adapted for use in connection with aswitch is, havingtwo' plungers 70, k, which respectively open and closethe circuit formed by the conductors 7& Z0.

To actuate-a switch of this type the piston rod is provided withoperating means, shown in the present case to consist of a yokelconnected with the piston rod and encircling the switch 7c, and plungers70, ]c"'.

During the outward movement of the piston rod 2' with the piston g, theyoke engages the plunger lcand moves it toopen the circuit through theswitch is, and this movement of the plunger is" positlons the plunger 70to be engaged by the yoke on the return stroke to again close. thecircuit.

A switch support preferably consisting of an outwardly extending arm onis bolted to the'cap d, and to thisarm is fixedly attached the switchis. As the type of switch will depend to a large extent on the systemwith'which the pressure regulating ap: paratus is used 1t maybenecessary to vary the structural arrangement of the support an and theswitch operating means, and adapt them to the particulartype of switchemployed. 7

Having thus fully, described my invention, what .I claim as new anddesire to secure by LettersPatent is: v

1. In a pressureregulat ng apparatus for electrically operated systems,apressure actuated motor comprising 'a' housing, a movable pistontherein, a piston rod for the piston, a pressure spring normallyresisting the movement of the piston and piston rod,

a pressure chamber opposed to the piston, an elastic diaphragm whosefree movement is restrictedonly by the movement of the piston,interposedbetween the piston and pressure chamber, with the whole of itsactive surface in contact with the piston throughout its travel and outof contact with it when not distended.

2. A pressure regulating apparatus comprising a housing, a movableplston therein,

a pressure chamber opposed to the piston,

active surface in contact. with the piston throughout its travel and outof contact with it when not distended, a pressure spring resisting themovement ofthe piston, and an abutment within the housing arresting themovement otthe piston towards thediaphragm and maintaining it out ofcontact with it until the diaphragm is distended. I

4;. A pressure regulating apparatus comprising a housing, movable pistontherein, a pressure chamber opposed to the piston, and an elasticdiaphragm, whose movement is restricted only by themovement of thepiston, interposed between the piston and pressure chamber, with tliewhole tr its active surface in contact with the piston throughout itstravel andout of contact with it when, not distended,v the surface orthe piston opposed to the diaphragm being concave.

5. prising a housing consisting of a cylindrical wall having an internalannular'enlarge ment extending to one end thereof, caps =fitted on theends of said wall one of which .is opposed to said enlargement, anelastic diaphragm interposed between the'end of the enlargement and thecorresponding cap, and a piston axially movable in thehousing ofcorresponding cross-sectional shape and dimensions to the bore of theenlargement having near its upper end a surrounding flange which whenthe piston is in its low pressure position, engagesthe inner end of theenlargement and arrests the: movement of the piston towards thediaphragm, said piston overlying the whole active area of the diaphragmwith which it contacts dur ing the whole of its movement.

6. A pressure regulating. apparatus comprising a housing consistingof acylindrical wall having an internal annular enlargement extending to oneend thereot,,caps fitted on the ends of said wall one of which isopposed to said enlargement, an 'elastic 'diaphragm interposed betweenthe end of the enIar 'ement .an dthe corresponding cap, and a p1stonaxlally movable in the housing,

A ressure remnan s aratus comof corresponding cross-sectional shape anddimensions to the bore of the enlargement having near its upper end asurrounding flange which, when the piston is in its low pressureposition, engages the inner end of the enlargement and arrests themovement 01. the piston towards the diaphragm, said piston overlying thewhole active area of the diaphragm with which it contacts during thewhole of its movement, the piston being slightly less in length than theenlargement so that when the diaphragm is not distended under pressure,it will be out of contact with the piston.

7 A pressure regulating apparatus comprising a housing consisting of acylindrical wall having an internal annular enlargement extending to oneend thereof, caps fitted on the ends of said Wall one of which isopposed to said enlargement, an elastic diaphragm interposed between theend of the enlargement and the corresponding cap, a piston axiallymovable in the housing, of corresponding cross-sectional shape anddimensions to the bore of the enlargement having near its upper end asurrounding flange which when the piston is in its low pressureposition, engages the inner end of the enlargement and arrests themovement of the piston towards the diaphragm, said piston overlying thewhole active area of the diaphragm with which it contacts during thewhole of its movement, a piston-rod for the piston extending axiallythrough said housing and a yoke at the outer end of the piston-rod.

Toronto, Ontario, November 16th, 1920.

MARTIN JOSEPH QUINN.

Signed in the presence of CHAS. H. RICHES, I. E. SHERRIFF.

